Enhancing Scale Inhibitor Squeeze Retention in Carbonate Reservoirs
- Louise Sutherland (An Ecolab Company) | Myles Jordan (An Ecolab Company) | Nalco Champion (An Ecolab Company)
- Document ID
- Society of Petroleum Engineers
- SPE International Oilfield Scale Conference and Exhibition, 20-21 June, Aberdeen, Scotland, UK
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 4.1 Processing Systems and Design, 5.8 Unconventional and Complex Reservoirs, 5 Reservoir Desciption & Dynamics, 4 Facilities Design, Construction and Operation, 1.8 Formation Damage, 5.8.7 Carbonate Reservoir, 1.8 Formation Damage, 4.3.4 Scale
- squeeze, coreflood, enhancement, retention/release
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The practice of scale squeeze treatments to oil/gas production wells to prevent inorganic scale formation has been applied for over 30 years and during that period different mechanisms to retain the inhibitor chemical have been evaluated. Many of these studies have focused on sandstone reservoir with less extensive studies carried out on carbonate substrates.
This paper details work carried out using ‘squeeze life enhancer’ chemicals within the Preflush and Overflush stages utilising a co-polymer containing a quaternary amine group to evaluate this chemicals effect on phosphonate scale inhibitor retention process. Phosphonate scale inhibitors are known to provide excellent squeeze lifetimes in carbonate reservoirs due to their strong interaction with the negatively charged formation using hydrogen ion bonding at low pH or calcium ion bridging at higher pH however with the aid of an enhancer chemical it was hoped to help the retention/release process and so provide further improved squeeze lifetimes. The location of the enhancer chemical within the squeeze process was the focus of the study. Enhancing adsorption of the scale inhibitor is not objective of this application study rather ensuring that the retained chemical is released into the flowing brine during production which is a challenge in carbonate reservoirs.
Laboratory work will be presented which evaluates the effect of using a polyaspartate enhancer within either the preflush or overflush stages to extend the lifetime of a commonly applied phosphonate scale inhibitor. These tests have been carried out using pack floods at 85°C with synthetic Middle East produced water and the details of the extension in treatment life observed are correlated to the inhibitor type tested and the sequence of application of the polymer enhancer utilised.
The study shows how the different functional groups within the scale inhibitor interact with the carbonate mineral surface and polymer enhancer to extend treatment lifetimes and so potentially reducing the frequency of squeeze treatments and therefore total cost of operations and it is order of application of these chemicals to the rock surface that prove to be critical to the extension observed.
|File Size||1 MB||Number of Pages||13|
Jordan, M.M, Edgerton, M.C, Cole-Hamilton, J and Mackin, K.: "The Application of Wax Divertor to Allow Successful Scale Inhibitor Squeeze Treatment to Sub Sea Horizontal Wells, North Sea Basin," paper SPE 49196prepared for the SPE Annual Technical Conference and Exhibition, New Orleans, Mississippi, 28-30 September 1998.
Bogaert, P.Berredo, M.C, Toschi, C, Jordan, M.M, Frigo, D.M, Morgenthaler, L, Bryson, B and Afonso, M.: "Scale inhibitor Squeeze Treatments Deployed from an FPSO in Deepwater, Subsea Fields in the Campos Basin", paper SPE 102505, presented at SPE Annual Technical Conference & Exhibition, 24-27th September 2006, San Antonio, Texas, USA.
Bogaert, P.,Berredo, M.C., Toschi, C.,Bryson, B.,Jordan, M.M, Frigo, D.M., and Afonso, M. "Managing Formation Damage Risk from Scale-Inhibitor Squeeze Treatments in Deepwater, Subsea Fields in the Campos Basin" SPE 107633presented at the SPE European Formation Damage Conference 30th May - 1st June 2007.
Jordan, M. M.,Graff, C. and Cooper, K.: "The Development and Deployment of a Scale Squeeze Enhancer and Oil Soluble Scale Inhibitor to Reduce Differed Oil Production Losses During Squeezing of Low Water Cut Wells, North Slope, Alaska.", resented at the SPE International symposium on Formation Damage Control, Lafayette, Louisiana, February 2000.
Jordan, M.M, Murray, F, Kelly, A. and Stevens, K.: "Deployment of Emulsified Scale -Inhibitor Squeeze to Control Sulphate/Carbonate Scales within Subsea Facilities in the North Sea Basin" SPE 80249. Presented at SPE International Symposium on Oilfield Chemistry, Houston, Texas, 5-7 February 2003.
Jordan, M.M., Sorbie, K.S., Jiang, P.,Yuan, M.D., Thiery, L. and Todd, A.C.: "The Effect of Clay Minerals, pH, Calcium and Temperature on the Adsorption of Phosphonate Scale Inhibitor onto Reservoir Core and Mineral Substrates," presented at NACE 94, Baltimore Convention Centre, Maryland, 28 February - 4 March 1994.
Jordan, M.M., Sorbie, K.S., Marulier, M.F., Taylor, K.,Hourston, K. and Griffin, P.: "Implication of Produced Water Chemistry and Formation Mineralogy on Inhibitor Adsorption/Desorption in Reservoir Sandstone and their Importance in the Correct Selection of Scale Squeeze Chemicals," presented at the RSC 6th International Symposium on Chemistry in the Oil Industry, Ambleside, Cumbria, UK, 14-17 April 1997.
Jordan, M.M. and Mackay, E.J.: "Scale Control in Chalk Reservoirs: The Challenge of Understanding the Impact of Reservoir Processes and Optimising Scale Management via Chemical Placement and Retention - from the Laboratory to the Field" SPE 105189, presented at the 15th SPE Middle East Oil and Gas Show and Conference, Bahrain, 11 - 14th March 2007.